Question

Решите пожалуйста! Даю 45 б.
2 cos x/3 -1=0

Answer 1

2cos x/3 = 1

cos x/3 =1/2

x/3= π/3+2πk
x/3=-π/3+2πk

x=π+6πk
x=-π+6πk

Answer 2

2cos(x/3)-1=0
cos(x/3)=1/2
x/3=-π/3+2πk U x/3=π/3+2πk
x=-π+6πk U x=π+6πk,k∈z